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Business combinations and disposals - Acquisition Related Contingent Consideration (Details) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2016 CAD | Dec. 15, 2015 USD ($) | Sep. 30, 2015 CAD | Dec. 31, 2010 CAD
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 623,091,000 | $ 617,094,000 | $ 606,453,000 | $ 556,722,000 | $ 578,683,000 | $ 572,301,000 | $ 481,794,000 | $ 467,043,000 | $ 2,403,360,000 | $ 2,099,821,000 | $ 1,700,912,000 |  |  |  |
DeltaWare | Sales targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  | CAD 4,000,000
Revenue |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Liability for potential obligation | CAD |  |  |  |  |  |  |  |  |  |  |  | CAD 0 |  | CAD 0 |
Assessments Australia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |
Contingent consideration, liability | $ 400,000 |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |

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- Definition Represents the maximum amount of contingent consideration payable, based upon sales of acquiree products in particular geographic markets. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Details
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